An example of a simile for random is "as random as a deck of cards at a casino".
A variant of the one above is "as random as a game of solitaire".
Another example is "as random as a throw of the dice".
One example you should be careful to use in the right context to avoid offence is "as random as a tourette outburst".
Further Information:
I recommend a book called Similes Dictionary by Elyse Sommer. You can find it in these places:
A simile.
A metaphor
As quick as a wink is a simile. ----
It is a simile.
simile It is an example of a simile (uses like or as). A simile in itself though is a type of metaphor.
simile
that man
It is a similie as you are comparing (something) to how sly the fox is. A similie uses the words "like or "as".
simile
simile
simile about dads
simile